Git: fatal: The current branch master has multiple upstream branches, refusing to push

I have this strange issue, whenever I do git push it refuses to do anything:

fatal: The current branch master has multiple upstream branches, refusing to push.

When I do git push -u origin master it seem to set it as a tracking branch:

Branch master set up to track remote branch master from origin.

But the next time I try git push it refuses to do this again. I tried to google but it seems the problem is fairly new and I couldn't find any explanation for this behaviour. Ideas?

Update: ./git/config

[remote "origin"]
    fetch = +refs/heads/*:refs/remotes/origin/*
    url = [email protected]:milk.git
[branch "master"]
    remote = origin
    merge = refs/heads/master

Update2: Solved with git config remote.origin.push HEAD the following line appeared in .git/config to [remote "origin"] section:

    push = HEAD

Update3:

$ git branch -vv
  billing      633c796 [origin/billing: behind 889] links
* master       1a0de50 [origin/master: ahead 1] more fixes
  new_master   3b880d7 [origin/new_master] branches diverged
  photo_stacks 29c8f0d [origin/photo_stacks] 1st try
  responsive   1dad980 [origin/responsive] update

$ git push
fatal: The current branch master has multiple upstream branches, refusing to push.

You might want to do the following:

git config remote.origin.push HEAD

Pushing without any arguments on a master branch can lead to your error message. I'm not sure if it's a regression problem, or if it's always been the case.

Run git config -l and look to see if you have multiple lines containing branch.master* references The [branch "master"] section may be duplicated ~/.gitconfig and .git/config. Deleting the one in ~/.gitconfig fixed the mutiple upstream branch detection for me.

You must specify which branch you are pushing to. git push would automatically attempt to push all the refs and tags that the local branches are tracking. It is possible that branches online at the server have moved forward. Therefore you might be ending up with this situation. You should simply use

git push origin master

And also to reconcile changes do a git pull That will update your local refs with the one from the server.